David, R. A., Dennis, J. S., Thomas, A. W., Jeffrey, D. C., James, J. C., Michael, J. F., & Jeffrey, W. O. (2023). Essentials of Statistics for Business and Economics (9th Edition). Cengage Learning, Inc.

David, R. Anderson, J. Sweeney Dennis, A. Williams Thomas, D. Camm Jeffrey, J. Cochran James, J. Fry Michael, ja W. Ohlmann Jeffrey. Essentials of Statistics for Business and Economics (9th Edition). Cengage Learning, Inc, 2023.

David, R. Anderson, et al. Essentials of Statistics for Business and Economics (9th Edition). Cengage Learning, Inc, 2023.